All manner of concrete, steel, and stone rubble from dredging, demolition projects, and other construction is used as artificial reef materials. This material is generally available at very low cost or free from construction companies who are more than happy to get rid of it. Transportation costs determine where this material is used by the Reef Program.
The Texas Star was built in 1977 on a multi-purpose supply ship hull, probably to service offshore oil platforms. The vessel was refitted as a floating casino in 1986, originally named Millionaire’s Casino, out of Savannah Georgia, but later moved to Texas and renamed Texas Star Casino. "The 12,000 square-foot vessel featured games such as craps, blackjack, roulette, poker and slot machines, with a bingo parlor situated on the nearby dock."
Phoenician colonies and voyages. Modified from The Challenger Reports (summary), 1895
Human populations through time have often flourished near the sea, partly because of the food resources that can be found there, but also because of the ease of transportation of people and cargo by boats. Observations about various organisms and environments were of course a major part of human activities since the earliest times, since the very survival of early Homo sapiens depended on this knowledge to obtain food and provide defense against dangerous plants and animals.